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《EARTH SCIENCE FRONTIERS》 1999-03
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CONTINENTAL SUBDUCTION AND UPLIFTING OF THE OROGENIC BELTS AT THE MARGIN OF THE QINGHAI-TIBET PLATEAU

Xu Zhiqin; Yang Jingsui; Jiang Mei; Li Haibing(Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037)  
The orognic belts at the margin of the Qinghai - Tibet Plateau have already been u-plifting since Cenozoic. The exhumation of the old metamorphic complex in these marginal oro-genic belts is related to three types of extrusion: (1) "thrust-extension" related to extrusion ofHimalayan type; (2) "opposite thrust" related to extrusion of Qilianshan type; (3) "thrust-transformation" related to extrusion of the Altun type. On the basis of geologied and geophysi-cal study, it is postulated that the exhumation of the orogenic belts is correlated to the inwar-subduction of the continental lithosphere around the plateau, i. e. (1) the Indian plate subduct-ed northward down to about 200 km deep under the Yalung Zangbo suture zone; (2) TheSiberian plate subducted southward at a low-angle down to 40 km deep beneath the Qilianshan;(3) The Tarim terrain subducted along the northern marginal thrust fault of the Altun Moun-tain southward down to 100 km deep under the Altun Mountain; (4) The Yangtze platewedged into the middie crust of the eastern Qinghai - Tibet Plateau. However, further study isneeded to verify the existence of westward movement of the Yangtze plate and that of the conti-nental subduction.
【Fund】: 国家自然科学基金!49732070;;原地质矿产部中法合作项目
【CateGory Index】: P542
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